Bathtub spa



FIG. 1 is a front and right side perspective view of of a bathtub spa showing our new design;

FIG. 2 is a front end elevational view of the bathtub spa of FIG. 1;

FIG. 3 is a right side elevational view of the bathtub spa of FIG. 1;

FIG. 4 is a left side elevational view of the bathtub spa of FIG. 1;

FIG. 5 is a rear end elevational view of the bathtub spa of FIG. 1.

FIG. 6 is a top plan view of the bathtub spa of FIG. 1; and,

FIG. 7 is a bottom plan view of the bathtub spa of FIG. 1. 

We claim the ornamental design for a bathtub spa, as shown and described. 